swing JCheckBox 更换复选框样式

Java Swing - 如何自定义JCheckBox复选标记图标

摘自 https://www.w3cschool.cn/java/codedemo-484050311.html

 import java.awt.Color;

 import java.awt.Component;

 import java.awt.Graphics;

 import java.awt.GridLayout;

 import javax.swing.AbstractButton;

 import javax.swing.ButtonModel;

 import javax.swing.Icon;

 import javax.swing.JCheckBox;

 import javax.swing.JFrame;

 class CheckBoxIcon implements Icon {

   public void paintIcon(Component component, Graphics g, int x, int y) {

     AbstractButton abstractButton = (AbstractButton) component;

     ButtonModel buttonModel = abstractButton.getModel();

     Color color = buttonModel.isSelected() ? Color.BLUE : Color.RED;

     g.setColor(color);

     g.drawRect(1, 1, 20, 20);

   }

   public int getIconWidth() {

     return 20;

   }

   public int getIconHeight() {

     return 20;

   }

 }

 public class Main {

   public static void main(String args[]) {

     JFrame frame = new JFrame();

     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     Icon checked = new CheckBoxIcon();

     Icon unchecked = new CheckBoxIcon();

     JCheckBox aCheckBox1 = new JCheckBox("Pizza", unchecked);

     aCheckBox1.setSelectedIcon(checked);

     JCheckBox aCheckBox2 = new JCheckBox("Calzone");

     aCheckBox2.setIcon(unchecked);

     aCheckBox2.setSelectedIcon(checked);

     Icon checkBoxIcon = new CheckBoxIcon();

     JCheckBox aCheckBox3 = new JCheckBox("Anchovies", checkBoxIcon);

     JCheckBox aCheckBox4 = new JCheckBox("Stuffed Crust", checked);

     frame.setLayout(new GridLayout(0, 1));

     frame.add(aCheckBox1);

     frame.add(aCheckBox2);

     frame.add(aCheckBox3);

     frame.add(aCheckBox4);

     frame.setSize(300, 200);

     frame.setVisible(true);

   }

 }

 //关键几行：

 URL uncheckedIconUrl = Thread.currentThread().getContextClassLoader().getResource("unchecked.png");

 URL checkedIconUrl = Thread.currentThread().getContextClassLoader().getResource("checked.png");

 Icon uncheckedIcon = new ImageIcon(uncheckedIconUrl);

 Icon checkedIcon = new ImageIcon(checkedIconUrl);

 JCheckBox cb = new JCheckBox("苹果");

 cb.setIcon(uncheckedIcon);

 cb.setSelectedIcon(checkedIcon);